The Top 40 is a radio format that measures the top forty songs in any music genre. The Top 40 became a dominant radio format in the 1960s, 1970s, and 1980s.

• Adult Top 40 (Billboard)
• Pop Songs (Billboard)
• UK Singles Chart
• Dutch Top 40 (is a Dutch music chart)
• Los 40 Principales (in Spain)
• Ö3 Austria Top 40 (the official Austrian music chart)

• Pete Battistini, "American Top 40 with Casey Kasem The 1970s", Authorhouse.com, January 31, 2005. ISBN 1-4184-1070-5
• Susan Douglas, Listening In: Radio and the American Imagination (New York: Times Books, 1999)
• Durkee, Rob (1999). American Top 40: The Countdown of the Century. New York: Schriner Books. ISBN 0-02-864895-1.
• Fisher, Mark (2007). Something in the Air: Radio, Rock, and the Revolution That Shaped a Generation. New York: Random House. ISBN 0-375-50907-0.
• Ben Fong-Torres, The Hits Just Keep On Coming: The History of Top 40 Radio (San Francisco: Backbeat Books, 1998)
• Elwood F. 'Woody' Goulart, The Mystique and Mass Persuasion: Bill Drake & Gene Chenault’s Rock and Roll Radio Programming Archived 2008-05-10 at the Wayback Machine (2006)
• David MacFarland, The Development of the Top 40 Radio Format (New York: Arno Press, 1979)

• Billboard Top 40 Mainstream Archived 2009-05-20 at the Wayback Machine
• Public Radio documentary featuring a history of Top 40

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